1//===- LineIterator.cpp - Implementation of line iteration ----------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "llvm/Support/LineIterator.h"
11#include "llvm/Support/MemoryBuffer.h"
12
13using namespace llvm;
14
| 1//===- LineIterator.cpp - Implementation of line iteration ----------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "llvm/Support/LineIterator.h"
11#include "llvm/Support/MemoryBuffer.h"
12
13using namespace llvm;
14
|
15line_iterator::line_iterator(const MemoryBuffer &Buffer, char CommentMarker)
| 15static bool isAtLineEnd(const char *P) {
16 if (*P == '\n')
17 return true;
18 if (*P == '\r' && *(P + 1) == '\n')
19 return true;
20 return false;
21}
22
23static bool skipIfAtLineEnd(const char *&P) {
24 if (*P == '\n') {
25 ++P;
26 return true;
27 }
28 if (*P == '\r' && *(P + 1) == '\n') {
29 P += 2;
30 return true;
31 }
32 return false;
33}
34
35line_iterator::line_iterator(const MemoryBuffer &Buffer, bool SkipBlanks,
36 char CommentMarker)
|
16 : Buffer(Buffer.getBufferSize() ? &Buffer : nullptr),
| 37 : Buffer(Buffer.getBufferSize() ? &Buffer : nullptr),
|
17 CommentMarker(CommentMarker), LineNumber(1),
| 38 CommentMarker(CommentMarker), SkipBlanks(SkipBlanks), LineNumber(1),
|
18 CurrentLine(Buffer.getBufferSize() ? Buffer.getBufferStart() : nullptr,
19 0) {
20 // Ensure that if we are constructed on a non-empty memory buffer that it is
21 // a null terminated buffer.
22 if (Buffer.getBufferSize()) {
23 assert(Buffer.getBufferEnd()[0] == '\0');
| 39 CurrentLine(Buffer.getBufferSize() ? Buffer.getBufferStart() : nullptr,
40 0) {
41 // Ensure that if we are constructed on a non-empty memory buffer that it is
42 // a null terminated buffer.
43 if (Buffer.getBufferSize()) {
44 assert(Buffer.getBufferEnd()[0] == '\0');
|
24 advance();
| 45 // Make sure we don't skip a leading newline if we're keeping blanks
46 if (SkipBlanks || !isAtLineEnd(Buffer.getBufferStart()))
47 advance();
|
25 }
26}
27
28void line_iterator::advance() {
29 assert(Buffer && "Cannot advance past the end!");
30
31 const char *Pos = CurrentLine.end();
| 48 }
49}
50
51void line_iterator::advance() {
52 assert(Buffer && "Cannot advance past the end!");
53
54 const char *Pos = CurrentLine.end();
|
32 assert(Pos == Buffer->getBufferStart() || *Pos == '\n' || *Pos == '\0');
| 55 assert(Pos == Buffer->getBufferStart() || isAtLineEnd(Pos) || *Pos == '\0');
|
33
| 56
|
34 if (CommentMarker == '\0') {
| 57 if (skipIfAtLineEnd(Pos))
58 ++LineNumber;
59 if (!SkipBlanks && isAtLineEnd(Pos)) {
60 // Nothing to do for a blank line.
61 } else if (CommentMarker == '\0') {
|
35 // If we're not stripping comments, this is simpler.
| 62 // If we're not stripping comments, this is simpler.
|
36 size_t Blanks = 0;
37 while (Pos[Blanks] == '\n')
38 ++Blanks;
39 Pos += Blanks;
40 LineNumber += Blanks;
| 63 while (skipIfAtLineEnd(Pos))
64 ++LineNumber;
|
41 } else {
42 // Skip comments and count line numbers, which is a bit more complex.
43 for (;;) {
| 65 } else {
66 // Skip comments and count line numbers, which is a bit more complex.
67 for (;;) {
|
| 68 if (isAtLineEnd(Pos) && !SkipBlanks)
69 break;
|
44 if (*Pos == CommentMarker)
45 do {
46 ++Pos;
| 70 if (*Pos == CommentMarker)
71 do {
72 ++Pos;
|
47 } while (*Pos != '\0' && *Pos != '\n');
48 if (*Pos != '\n')
| 73 } while (*Pos != '\0' && !isAtLineEnd(Pos));
74 if (!skipIfAtLineEnd(Pos))
|
49 break;
| 75 break;
|
50 ++Pos;
| |
51 ++LineNumber;
52 }
53 }
54
55 if (*Pos == '\0') {
56 // We've hit the end of the buffer, reset ourselves to the end state.
57 Buffer = nullptr;
58 CurrentLine = StringRef();
59 return;
60 }
61
62 // Measure the line.
63 size_t Length = 0;
| 76 ++LineNumber;
77 }
78 }
79
80 if (*Pos == '\0') {
81 // We've hit the end of the buffer, reset ourselves to the end state.
82 Buffer = nullptr;
83 CurrentLine = StringRef();
84 return;
85 }
86
87 // Measure the line.
88 size_t Length = 0;
|
64 do {
| 89 while (Pos[Length] != '\0' && !isAtLineEnd(&Pos[Length])) {
|
65 ++Length;
| 90 ++Length;
|
66 } while (Pos[Length] != '\0' && Pos[Length] != '\n');
| 91 }
|
67
68 CurrentLine = StringRef(Pos, Length);
69}
| 92
93 CurrentLine = StringRef(Pos, Length);
94}
|